.student {
  opacity: .2;
}

.student-appear {
  opacity: .2;
}
.student-appear.student-appear-active {
  opacity: 1;
  transition: opacity .5s;
}
.student-leave {
  opacity: 1;
  transition: all .5s ease-in;
}
.student-leave.student-leave-active {
  opacity: 0;
}

.title {
  color: red;
}